Customer Acquisition Cost Calculator
Find what it costs to win each new customer.
Results update as you type.
How it works
A customer acquisition cost calculator reveals what your business actually pays to win each new customer, dividing your marketing and sales spend by the number of customers that spend produced. CAC is one of the defining metrics of any growing company, because it answers whether you can afford to grow: if it costs more to acquire a customer than that customer is worth, scaling simply multiplies your losses. You enter the total spend and the number of new customers, and the tool returns the average cost of each acquisition on a clean, comparable basis. That figure becomes the yardstick for almost every growth decision. Set against customer lifetime value, it shows whether your unit economics work, with the LTV to CAC ratio serving as a quick health check that investors and operators alike rely on. Tracked over time, a rising CAC warns that channels are saturating, competition is intensifying, or targeting is slipping, often long before the damage shows up in the bottom line. Compared across channels, it reveals where growth is cheap and where it is expensive, guiding budget toward the most efficient sources. Founders, marketers, growth leads and finance teams use a customer acquisition cost calculator to size marketing budgets, judge whether a channel is sustainable, set payback-period targets, and prove that the money spent chasing growth returns more than it costs. Because it is a simple average, it is easy to compute yet powerful enough to anchor an entire growth strategy around disciplined, profitable acquisition rather than growth at any price.
CAC = marketing spend ÷ new customers acquired
Customer acquisition cost divides the total spent on winning customers over a period by the number of new customers gained in that period. The result is the average price of growth, one customer at a time. Because new customers are the denominator, more efficient marketing that converts the same spend into more customers drives CAC down. Compared against lifetime value, CAC decides whether acquisition is an investment that pays back or a cost that outruns the revenue each customer eventually returns.
Source:Standard marketing metric (CAC)
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter marketing spend and new customers.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Acquisition cost updates instantly as you type — no button to press.
Frequently asked questions
What is customer acquisition cost?
Customer acquisition cost, or CAC, is the average amount your business spends on marketing and sales to gain one new customer. It bundles everything invested in winning customers over a period, ad spend, campaign costs and often sales effort, and divides by the customers acquired. CAC is central to understanding whether growth is affordable, because a business that pays more to acquire a customer than that customer returns cannot scale profitably no matter how fast it grows.
How does CAC relate to lifetime value?
CAC and lifetime value are two halves of a business's unit economics. LTV is what a customer is worth over time; CAC is what it cost to win them. The ratio between them, LTV divided by CAC, shows whether acquisition pays off, with a figure around three to one widely considered healthy. If CAC approaches or exceeds LTV, each new customer erodes rather than builds value, signalling that either acquisition costs or retention need urgent attention.
What is a good CAC?
There is no universal good CAC, because it only means something relative to what a customer is worth and how long they take to pay back. A fifty-dollar CAC is excellent if customers are worth hundreds and repay quickly, but ruinous for a thin-margin one-off sale. Judge CAC against lifetime value and payback period rather than in isolation, and aim to keep it low enough that customers become profitable well within an acceptable timeframe.
How can I reduce customer acquisition cost?
Improve conversion rates so more of your existing traffic becomes customers without extra spend, and sharpen targeting to reach audiences that convert more cheaply. Invest in lower-cost channels like referrals, content and organic search that compound over time, strengthen retention so word of mouth grows, and cut spend on underperforming campaigns. Better onboarding and product experience also drive referrals, which are among the cheapest customers you can acquire and lower blended CAC.
Should CAC include salaries and overhead?
A fully loaded CAC includes not just ad spend but also the salaries, tools and overhead tied to acquiring customers, which gives the truest picture of what growth costs. A simpler paid CAC counts only direct advertising spend, useful for optimising campaigns quickly. Both have their place: use the simple version for day-to-day channel decisions and the fully loaded version for strategic planning and investor reporting, being clear which one you are quoting.